Add extra settings for git on win32

Change-Id: I0012c79ab0c81ddbfe263a99f87e7c05b65e18ec
Reviewed-on: http://review.couchbase.org/38230
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>